package collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionDemo {
    public static void main(String[] args) {

        Collection cc = new ArrayList();
        Point pp = new Point(1,3);
        cc.add(pp);
        pp.setX(100);
        System.out.println(cc);


        /*
        Collection c = new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(1,2));
        System.out.println(c);

        Point p = new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println(contains);

        c.remove(p);
        System.out.println(c);

        c.remove(p);
        System.out.println(c);

        Point p1 = new Point(9,0);
        c.remove(p1);
        System.out.println(c);

        Point p2 = new Point(9,0);
        boolean contain1 = c.contains(p2);
        System.out.println(contain1);

 */




        /*
        Collection c = new ArrayList();
        c.add("6");
        c.add("7");
        c.add("8");
        c.add("9");
        c.add("10");
        System.out.println(c);

        System.out.println("size:"+c.size());
        System.out.println("是否为空集:"+c.isEmpty());

        c.clear();
        System.out.println("集合已清空");
        System.out.println(c);
        System.out.println("size:"+c.size());
        System.out.println("是否为空集:"+c.isEmpty());
         */

    }
}
